* Noun: When referring to the WWE wrestling event, it's a noun.
* Example: "I went to the Smackdown event last night."
* Verb: When referring to the act of decisively defeating someone, it's a verb.
* Example: "The underdog smackdowned the champion in the final round."
* Interjection: Used to express surprise, excitement, or approval, it's an interjection.
* Example: "Smackdown! That was an amazing goal!"
So, the part of speech depends on how "smackdown" is being used in the sentence.